Question

            try
            {
                rssDoc = new XmlDocument();
                // Load the XML context into XmlDocument
                rssDoc.Load(rssReader);
                MessageBox.Show(rssDoc.ToString());
            }
            catch (Exception ex)
            {
               errorProvider1.SetError(url, "Cannot load the RSS from this url");
            }
            // Loop for <rss> tag in xmldocument
            for (int i = 0; i < rssDoc.ChildNodes.Count; i++)
            {
                // If <rss> tag found
                if (rssDoc.ChildNodes[i].Name == "rss")
                {
                    // assign the <rss> tag node to nodeRSS
                    nodeRss = rssDoc.ChildNodes[i];
                }
            }
            //Loop for the <channel> tag in side <rss> tag stored in nodeRss
            for (int i = 0; i < nodeRss.ChildNodes.Count; i++)  <<<<<<EXCEPTION
            {
                // <channel> node found
                if (nodeRss.ChildNodes[i].Name == "channel")
                {
                    //assign the <channel> tag to nodeChannel 
                    nodeChannel = nodeRss.ChildNodes[i];
                }
            }

Above code is working fine for most of the rss feeds but I am getting a nullrefrence exception while going through the last loop.
What should i do to make it work?

Answer 1

Why reinvent the wheel?

XmlNode nodeChannel = rssDoc.SelectSingleNode("/rss/channel");

…should do the trick. (I’m pretty sure RSS only allows a single channel element inside the root rss element. Otherwise, look at SelectNodes() rather than SelectSingleNode().)